Kiuwan On-Premises (KoP) is based on a client-server architecture that includes these major server components:
- Apache web server
- Wildfly application server
- MySQL database
- Redis in-memory data store
Kiuwan On-Premises can be installed on a single host or on multiple hosts (externalizing one, some or all of the provided infrastructure services).
You can also install Kiuwan On-Premises under your own AWS cloud, replacing the provided infrastructure services with compatible AWS services.
Kiuwan On-Premises and its roles
Kiuwan On-Premises defines three different roles for each Kiuwan service instance:
- Kiuwan front: receives and answers HTTPS, HTTP or AJP requests (depending on your configuration) from the Apache web server (or directly from a client, depending on your configuration), both for the web application and REST API calls.
- Kiuwan analyzer: processes analysis results asynchronously.
- Kiuwan scheduler: processes background tasks such as notifications and Kiuwan Insights database updates.
The default installation will create a Kiuwan service instance for each role.
Supplied services
All needed services are supplied as Docker containers. The following table summarizes all the available services:
| Service | Docker service name | Description |
| Kiuwan front | wildflykiuwan-f[n] | A Kiuwan front instance |
| Kiuwan analyzer | wildflykiuwan-a[n] | A Kiuwan analyzer instance |
| Kiuwan scheduler | wildflykiuwan-s[n] | A Kiuwan scheduler instance |
| Kiuwan updater | updaterkiuwan | The Kiuwan container that manages Kiuwan On-Premises installations and updates |
| Apache | apacheloadbalancer | The Apache web server instance that works as a front-end server and load balancer |
| MySQL | mysqlkiuwan | The Kiuwan database |
| Redis | redis_0000[n] | A Redis in-memory data store node |
| Redis cluster creator | clustercreator | The Redis container that manages the Redis cluster creation |
The following diagram shows how Kiuwan On-Premises would be set out by default (that is, a single host default installation):
The main purpose of each piece is (service names are shown between parentheses):
- Apache (ApacheLoadBalancer): balances traffic between Kiuwan frontends (kept in the default installation to allow easy frontend scaling).
- Kiuwan front (wildflykiuwan-f1): receives and processes HTTPS requests.
- Kiuwan analyzer (wildflykiuwan-a1): processes analyses.
- Kiuwan scheduler (wildflykiuwan-s1): executes background tasks.
- MySQL (mysqlkiuwan): stores Kiuwan data.
- Redis cluster (redis_0000[n]): used by Kiuwan as a data cache.
- Redis cluster creator (clustercreator): configures each Redis node as a cluster.
- Kiuwan updater (updaterkiuwan): installs, updates, and upgrades the needed data or configuration.
Clustering support
Depending on your needs, the Kiuwan On-Premises architecture supports both clustered environments and single-host installations. You can:
- Keep all services in an all-in-one host installation.
- Decide where each service will be installed, one by one (both Kiuwan services and infrastructure).
- Externalize one, some, or all of the provided non-Kiuwan services:
- Apache load balancer
- MySQL
- Redis
All Kiuwan instance containers can be scaled up (to a limit) or down to the default configuration. This means that you can start more containers of each Kiuwan role depending on your load needs.
To illustrate the flexibility that Kiuwan On-Premises installation tool provides, an alternative and possible configuration is depicted in the following image (Kiuwan Cloud and temporal services were omitted to simplify the diagram):
As the picture shows, you can distribute Kiuwan On-Premises services across different hosts and use external services to replace some of the ones provided.
Note that although distributed architecture is feasible, we do not provide explicit documentation on how an installation of this kind has to be performed, as there are plenty of manual steps, and usually, the single-host approach is valid for most customers. In case your company needs more advanced architectural solutions for a Kiuwan On-Premises Distributed installation, please contact Kiuwan support.